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A146464
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 7, 21, 55, 263, 1645, 13423, 126629, 1447199, 21743065, 415978809, 9965909653, 303132585251, 11591760284391, 555704916934105, 33613901189599473, 2574475177790739409
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.1.0.0.1.0.0.1.0
.0.0.0.1.1.1.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A146400 A146408 A050894 * A001354 A200930 A088656
KEYWORD
nonn
AUTHOR
STATUS
approved